Boots and Bags Ltd. reported a gross profit margin of 25% in 2018. Indicate which of the following items would result in an increase in the company's gross profit margin in 2019. a. An increase in the number of boots and bags sold. b. A decrease in the commission rate for selling each bag or pair of boots. c. A decrease in the wholesale cost of bags. O d. A decrease in the number of customers paying promptly and not taking the company's 2% discount for paying in under 10 days. O e. An increase in the selling price of boots. O f. An increase in freight in costs. O g. An increase in the wholesale cost of boots